Secure L1/L2 centric inter-cell mobility execution

Abstract

In general, the current subject matter relates to secure layer 1/layer 2 (L1/L2) centric inter-cell mobility execution. In some implementations, secure L1/L2 centric inter-cell mobility execution can include mapping a physical cell identifier (PCI) of at least one L1/L2 triggered mobility (LTM) target cell of at least one target distributed unit (DU) of a base station that is a candidate for handover (HO) for a user equipment (UE) to an index, and securely transmitting the mapping from a centralized unit control plane (CU-CP) of the base station to the UE and to a serving DU of the base station that is currently serving the UE for at least one service.

What is claimed: 
     
       1. An apparatus, comprising:
 at least one processor; and 
 at least one non-transitory storage media storing instructions that, when executed by the at least one processor, cause the at least one processor to perform operations comprising:
 mapping a physical cell identifier (PCI) of at least one layer 1/layer 2 triggered mobility (LTM) target cell of at least one target distributed unit (DU) of a base station that is a candidate for handover (HO) for a user equipment (UE) to an index; and 
 securely transmitting the mapping from a centralized unit control plane (CU-CP) of the base station to the UE and to a serving DU of the base station that is currently serving the UE for at least one service. 
 
 
     
     
       2. The apparatus of  claim 1 , wherein the index for each of the at least one LTM targets cells is unique in the mapping such that each index is uniquely associated with one of the at least one LTM target cells by PCI. 
     
     
       3. The apparatus of  claim 1 , wherein the operations further comprise securely transmitting the mapping from the CU-CP to a target DU including a one of the at least one LTM targets cells selected for the HO. 
     
     
       4. The apparatus of  claim 1 , wherein the mapping is transmitted to the UE in a radio resource control (RRC) reconfiguration message; and
 the mapping is transmitted to the serving DU in an F1 UE context modification request message. 
 
     
     
       5. The apparatus of  claim 1 , wherein the operations further comprise:
 updating the mapping in response to at least one of:
 one of the at least one LTM targets cells being removed for the UE, and 
 one of the at least one LTM targets cells being replaced for the UE; and securely transmitting the updated mapping from the CU-CP to the UE and the serving DU. 
 
 
     
     
       6. The apparatus of  claim 1 , wherein the operations further comprise:
 mapping a PCI of at least one LTM target cell of the at least one target DU that is a candidate for HO for a second UE to an index such that a second mapping is created; and 
 securely transmitting the second mapping from the CU-CP to the second UE. 
 
     
     
       7. The apparatus of  claim 1 , wherein the serving DU utilizes the index received from the CU-CP when transmitting an LTM HO command to the UE. 
     
     
       8. The apparatus of  claim 1 , wherein each index is one of numerical, alphabetical, and alphanumeric. 
     
     
       9. The apparatus of  claim 1 , wherein the operations further comprise storing the mapping in the at least one non-transitory storage media. 
     
     
       10. The apparatus of  claim 1 , wherein the base station includes a Next Generation Radio Access network (NG-RAN) node. 
     
     
       11. The apparatus of  claim 10 , wherein the NG-RAN node includes a gNodeB or a ng-eNodeB. 
     
     
       12. The apparatus of  claim 1 , wherein the base station includes the at least one processor and the at least one non-transitory storage media. 
     
     
       13. The apparatus of  claim 12 , wherein the CU-CP includes the at least one processor and the at least one non-transitory storage media. 
     
     
       14. At least one non-transitory storage media storing instructions that, when executed by at least one processor, cause the at least one processor to perform operations comprising:
 mapping a physical cell identifier (PCI) of at least one layer 1/layer 2 triggered mobility (LTM) target cell of at least one target distributed unit (DU) of a base station that is a candidate for handover (HO) for a user equipment (UE) to an index; and 
 securely transmitting the mapping from a centralized unit control plane (CU-CP) of the base station to the UE and to a serving DU of the base station that is currently serving the UE for at least one service. 
 
     
     
       15. The non-transitory storage media of  claim 14 , wherein the index for each of the at least one LTM targets cells is unique in the mapping such that each index is uniquely associated with one of the at least one LTM target cells by PCI. 
     
     
       16. The non-transitory storage media of  claim 14 , wherein the operations further comprise securely transmitting the mapping from the CU-CP to a target DU including a one of the at least one LTM targets cells selected for the HO. 
     
     
       17. A computer-implemented method, comprising:
 mapping a physical cell identifier (PCI) of at least one layer 1/layer 2 triggered mobility (LTM) target cell of at least one target distributed unit (DU) of a base station that is a candidate for handover (HO) for a user equipment (UE) to an index; and 
 securely transmitting the mapping from a centralized unit control plane (CU-CP) of the base station to the UE and to a serving DU of the base station that is currently serving the UE for at least one service. 
 
     
     
       18. The method of  claim 17 , wherein the index for each of the at least one LTM targets cells is unique in the mapping such that each index is uniquely associated with one of the at least one LTM target cells by PCI. 
     
     
       19. The method of  claim 17 , further comprising securely transmitting the mapping from the CU-CP to a target DU including a one of the at least one LTM targets cells selected for the HO.